Ormehommknuten Pegmatite Outcrop, Evje og Hornnes, Agder, Norwayi
| Regional Level Types | |
|---|---|
| Ormehommknuten Pegmatite Outcrop | Pegmatite |
| Evje og Hornnes | Municipality |
| Agder | County |
| Norway | Country |
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Latitude & Longitude (WGS84):
58° 39' 59'' North , 7° 45' 40'' East
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Byglandsfjord | 332 (2014) | 3.0km |
| Vennesla | 10,931 (2014) | 45.9km |
| Birkeland | 2,254 (2010) | 46.3km |
| Tveit | 1,397 (2010) | 52.5km |
| Strai | 1,266 (2013) | 53.9km |
During a geological hike July 2022 in the mountains in the northernn part of the Evje og Hornnes municipality, a minor hilltop north of lake Ormehommtjønn was climbed, and turned out to be a relatively large pegmatite outcrop.
The hilltop consists of two parallel ridges (S-N) with a trench-like middle section. The higher parts of the hilltop all consist of a light-coloured, relatively fine-grained pegmatite, while the middle section consists of steeply dipping amphibolite (70-80 degrees E). This suggests that there might be two parallel orientated pegmatite dykes separated by amphibolite.
The similarity of this locality with many of the pegmatites of the Evje-Iveland district is striking.
The entire area between this hilltop and the start of the track near lake Nordtjønn (58.658006,7.781443) is laced with hundreds, if not thousands of minor pegmatite dykes and migmatites. Many of them are short, but a good number of them have a striking length of 10-20 m, and longer ones have also been observed. Width of the veins varies from a few cm to 10-30 cm, rarely more than that.
Occassionaly the pegmatites show some symmetry, with accumulations of massive quartz in the middle.
Mineralogically seen the pegmatites are as far as could be seen during a short visit of no interest whatsoever.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Albite Formula: Na(AlSi3O8) References: (n.d.) Evje og Hornnes geomuseum Fennefoss Collection.Photo ID: 1234532 |
| ⓘ 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 References: (n.d.) Evje og Hornnes geomuseum Fennefoss Collection.Photo ID: 1234532 |
| ⓘ Microcline Formula: K(AlSi3O8) References: (n.d.) Evje og Hornnes geomuseum Fennefoss Collection.Photo ID: 1234532 |
| ⓘ Quartz Formula: SiO2 References: (n.d.) Evje og Hornnes geomuseum Fennefoss Collection.Photo ID: 1234532 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Microcline | 9.FA.30 | K(AlSi3O8) |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| Unclassified | |||
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | Oxygen | |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| O | ⓘ Microcline | K(AlSi3O8) |
| O | ⓘ Quartz | SiO2 |
| F | Fluorine | |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Mg | Magnesium | |
| Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Al | ⓘ Microcline | K(AlSi3O8) |
| Si | Silicon | |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Si | ⓘ Microcline | K(AlSi3O8) |
| Si | ⓘ Quartz | SiO2 |
| K | Potassium | |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| K | ⓘ Microcline | K(AlSi3O8) |
| Ti | Titanium | |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Fe | Iron | |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Other Regions, Features and Areas containing this locality
Eurasian PlateTectonic Plate
- Baltic Shield
- Sveconorwegian BeltShield
EuropeContinent
Norway
- ⭔Aust-AgderCounty
ScandinaviaRegion
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Ormehommknuten Pegmatite Outcrop, Evje og Hornnes, Agder, Norway